Eating disorders within males are relatively uncommon, with estimates suggesting incidence rates of only five percent of the sample. This single-subject, reversal design case study examines the etiological variables of a 22-year-old male bulimic patient. Consultation for treatment was made by the patient's parents. Family assessment made in the home provided for observation of the patterns and dynamics of their interaction. It was apparent that marital and family distress contributed to the disorder. Additional evaluation included psychodiagnostic testing, functional analysis of the binge-purge symptoms, and nutritional assessment. Individual and family therapy were valuable in reducing the frequency and duration of binging and purging, yet a pattern of nocturnal binging remained recalcitrant to change. Assessment of sleeping patterns and daytime substance use revealed a sleep onset and sleep maintenance disturbance. Innovative nutritional treatments were employed, including use of amino acids, vitamins, and herbal supplements. Relaxation training and behavior therapy were also utilized. This combined intervention produced complete remission of symptoms within one month. The family vacation gave opportunity to reverse the intervention when the patient failed to complete his nutritional regimen. The sleeping difficulty and night binging returned. Upon reinstitution of treatment, binges and sleep problems returned to base-line. The patient remained symptom-free at one-year follow-up, suggesting the value of the intervention and proper termination/withdrawal. (Author/ABL)